I can tell you first off to forget the 1987 with the twin right-hand rotation Alpha drives. If it's older it probably has TRS and if it's newer it may have Bravos.
Check the bottom for stress cracks forward of the engines. Also, check the lateral bulkhead below the rear seat where it is tabbed to the bottom inside.
If there is an odor of gasoline it may need a new tank.
Be careful. Get a survey from a surveyor who understands this type boat.